Add new header to G3 build

Change-Id: Ided179a23c0f700c866f9f174a0221d1e6b3abc8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/644877
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed